JPH0545370Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil mist collecting device, and particularly to an inertial collision type device.

[Conventional technology]

An inertial collision type oil mist collection device is used as a means for condensing and removing cutting oil mist (oil mist) generated from machine tools. Various structures have been proposed as such oil mist collection devices, and one example is the one disclosed in Japanese Patent Application Laid-Open No. 1983-1999.
The one described in Publication No. 34713 is known.

The structure of this is explained by referring to the claims of the above-mentioned publication: ``A plurality of spiral blades are provided in the cylinder body so as to share the axis, and a plurality of spiral blades are provided between each spiral blade. forming a spiral passage of strips;
The inlet and outlet of each spiral passage are provided in the same plane perpendicular to the axis, and an eliminator is built in so that the positions of the inlets and outlets are shifted from each other around the axis.

And, ``When the oil smoke passes through the eliminator, it collides with the spiral blade and rotates in a spiral shape. Because of this spiral rotation, the oil mist in the oil smoke is blown away by centrifugal force and is separated and captured from the oil smoke. It is. (Page 5 of the above bulletin, lower left column, line 17 to lower right column, line 1) In addition to this, it is possible to create a circular air flow in the oil smoke using a baffle plate to efficiently separate oil by the action of centrifugal force. Oil smoke filter for the purpose of
-99722) is known.

[Problem that the invention attempts to solve]

However, conventional systems in general, including this conventional example, have problems such as complex structures, difficult manufacturing and maintenance, high costs, and high pressure loss of airflow passing through the interior. There is. Further, in the method disclosed in Japanese Utility Model Application Publication No. 55-99722, only a circular air flow is generated and oil mist cannot be collected well.

As a result of research aimed at solving these technical issues, we found that by providing an oil mist passage conduit with alternating enlarged and reduced cross-sectional areas, the air flow containing oil mist is agitated, and the oil It has been found that the mist becomes larger in particle size, making it easier to collect, and that the device can be constructed with a simple structure.

By the way, as an example of forming the cross-sectional area of a pipe by repeating an enlarged part and a reduced part, it is not an oil mist collection device, but it is used as a tubular separation membrane.
It is known from Publication No. 20601.

In this tubular separation membrane, a turbulence generating protrusion is formed on the inner surface of the porous tubular separation membrane body to form a reduced section of the pipe cross-sectional area. The purpose of this invention is to generate turbulence in the fluid flowing through the membrane to prevent components whose permeation is restricted from growing in layers on the inner wall of the membrane to maintain good filtration efficiency at all times.
Unlike turbulence caused for growth, purpose
The effects are different.

The present invention was developed based on these research results, and the technical challenge is to create an oil mist collecting device that has a simple structure and can efficiently collect oil mist from gas. It is.

[Means for solving problems]

That is, the present invention provides a chamber 21 that covers the oil mist generation source, connects the oil mist suction pipe 10 to this chamber 21, and provides the oil mist suction pipe 10 with an enlarged section 1a and a reduced section 1b of cross-sectional area. Alternating oil mist passage pipes 1
A trap 2 with which the oil mist collides is provided on the downstream side of the oil mist passage conduit 1.

[Effect]

When the airflow containing oil mist passes through the oil mist passage pipe 1, the airflow becomes turbulent due to the repetition of the enlarged cross-sectional area portion 1a and the reduced cross-sectional area portion 1b of the pipe line 1.

Therefore, the fine particles of oil mist in the airflow collide with each other due to turbulence, aggregate, and grow large.
The mass of the grains increases.

The straight-line action due to inertia is greater as the oil mist particles are larger and have a greater mass, and as the wind speed is faster.

Therefore, the oil mist that has grown to a large size is caused to collide with the capture body 2, adhere to it, and capture it.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

<First embodiment> As shown in FIG. 1, an oil mist passage conduit 1 is vertically connected to the upper part of a sealing chamber 21 that surrounds a grinding device 20. A duct 3 is horizontally connected to the upper end of the duct 1.

The oil mist passage conduit 1 consists of two stacked spherical conduit units 5 each having upper and lower openings of a hollow sphere and flanges 4 provided at the upper and lower opening edges, respectively, and the lower spherical conduit unit 5 having the above-mentioned structure. A straight pipe 6 is connected to a sealing chamber 21, and a drain 7 is provided at the lower end of the straight pipe 6.

By stacking the spherical conduit units 5 in two stages, the conduit 1 has an enlarged cross-sectional area 1a twice and a reduced cross-sectional area 1b three times.

In addition, a joint pipe 8 that continues to the duct 3 with the diameter of the reduced part 1b is connected to the reduced cross-sectional area part 1b of the upper spherical conduit unit 5, and the pipe wall surface of the duct 3 facing the joint pipe 8 is covered with oil. Mist passage pipe 1
It serves as a trap 2 that collides with oil mist flowing from the oil mist.

The flange 4 connects the spherical pipe unit.
They are bolted together.

Further, a fan (not shown) is attached to the downstream side of the duct 3, and airflow containing oil mist passes through the pipe line 1 by being sucked by the fan.

Next, the operation of this embodiment will be described.

The airflow containing oil mist rising from the grinding device 20 passes through the oil mist passage conduit 1 by the suction force of the fan, but at this time, it passes sequentially through the enlarged cross-sectional area section 1a and the reduced cross-sectional area section 1b. and stirred. Therefore, the oil mist particles in the air flow collide with each other and aggregate and grow into large particles.
Then, the grown oil mist particles are collected by the trapping body 2.
The oil collides with the pipe wall surface of the barrel duct 3 and is captured, and the captured oil travels along the pipe wall of the oil mist passage conduit 1 and is drained from the drain outlet 7. On the other hand, the airflow from which the oil mist has been removed is discharged from the duct 3 to the outside.

In this embodiment, since the oil mist passage conduit 1 is formed by the spherical conduit units 5, by changing the number of the spherical conduit units 5, it is possible to easily repeat the enlarged cross-sectional area portion 1a and the reduced cross-sectional area portion 1b. You can change the number of times.

Further, the flange 4 of the spherical conduit unit 5 also functions as a heat sink.

Furthermore, during maintenance, the bolts on the flange 4 are removed, the conduit unit 5 is removed, and the inside is cleaned.

The apparatus of this first embodiment and the elbows 2 bent at 90 degrees at both ends of the standpipe 23 as shown in FIG.
Using the oil mist collector equipped with 2,
The collection efficiency was measured with respect to the particle size of oil mist. For measurement, oil mist measuring instruments were installed at the inlet and outlet sides of the device, and the amount of oil mist reduced after passing through the device was expressed as a ratio. The results are shown in Figure 3.

The oil mist collection efficiency was also measured when the wind speed in the duct 1 was changed. The results are shown in FIG.

As is clear from FIGS. 3 and 4, the apparatus of the present invention has good oil mist collection efficiency.

<Second Example> In this example, as shown in FIG.
The spherical conduit unit 5 has three stages, the duct 3 connected to the upper end of the oil mist passage conduit 1 is inclined, and the drain outlet 9 is provided at the lower end of this inclined duct 3. This is the same as the first embodiment.

In this way, the oil trapped on the pipe wall surface of the duct 3, which is the trapping body 2, has a low rate of being transmitted through the pipe wall of the oil mist passage pipe 1, and is therefore less likely to be re-splattered into the airflow. .

<Third Embodiment> In FIG. 6, the spherical conduit unit 5 is further cut in half to form a hemispherical shape, and a flange 4 is also provided at the opening edge of the half-cut cross section.

The greater the number of flanges 4, the greater the heat dissipation effect. Furthermore, since the spherical portion can be separated, maintenance is further facilitated.

<Fourth Example> As shown in FIG. 7, in the fourth example, the oil mist passage conduit 1 of the third example is housed in a housing 11, and the housing 11 has a refrigerant inlet 12. and refrigerant outlet 1
3 is provided, and a refrigerant is passed through the housing 11 to cool the oil mist passage conduit 1. By cooling, the oil mist in the airflow is cooled and condensed, and is captured more efficiently.

<Fifth Embodiment> The fifth embodiment shown in FIG. 8 is different from the second embodiment in that a nozzle 14 tapered toward the pipe wall surface of the duct 3, which is the trapping body 2, is added to the oil mist. It is provided at the upper end of the passage pipe 1, and the flow velocity of the air flow is increased in this nozzle 14 portion, thereby increasing the impact effect on the trapping body 2.

<Sixth Embodiment> As shown in FIG. 9, in this embodiment, the duct 3 is not connected to the oil mist passage pipe 1 as in the previous embodiments, but a tip is provided on the downstream side of the pipe 1. An umbrella-shaped capture body 2 with the flow direction oriented is supported on the pipe wall surface by a plurality of legs 15.

The oil captured by the capture body 2 travels along the legs 15 to the pipe wall surface and is discharged from the drain 7.

<Seventh Embodiment> In this embodiment, as shown in FIG. 10, the oil mist passage conduit 1 is formed into a straight pipe unit in which flanges 4 are provided around the upper and lower opening edges of a straight pipe. 16 are stacked one on top of the other, and an orifice 17 having a diameter smaller than the inner diameter of the straight pipe is interposed at the connecting portion of the straight pipe unit 16.

[Effect of idea]

According to the present invention, the oil mist passage conduit is
Because it is formed by repeating an enlarged cross-sectional area part and a reduced cross-sectional area part, the airflow passing through this area is stirred,
The oil mist particles collide with each other, coagulate, and grow large, and the grown oil mist is collected by colliding with the trapping body, so the collection efficiency is high and the oil mist can be collected.

In addition, it can have an extremely simple structure, is easy to maintain, and can be easily and inexpensively manufactured. Furthermore, since the structure of the pipe is simple, there is little pressure loss in the airflow.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing the first embodiment of the present invention, Figure 2 is a diagram showing a comparative example, and Figures 3 and 4 are cross-sectional views showing the first embodiment of the present invention.
A graph showing the difference in collection efficiency between the devices of Example and Comparative Example, FIG. 5 is a cross-sectional view showing the second example, FIG. 6 is a cross-sectional view showing the third example, and FIG. 8 is a sectional view showing the fifth embodiment, FIG. 9 is a sectional view showing the sixth embodiment, and FIG. 10 is a sectional view showing the seventh embodiment. DESCRIPTION OF SYMBOLS 1... Oil mist passage pipe, 1a... Cross-sectional area enlargement part, 1b... Cross-sectional area reduction part, 2... Capture body, 10... Oil mist suction pipe, 21... Chamber.

Claims (1)

[Scope of utility model registration request] A chamber 21 is provided to cover the oil mist generation source, and an oil mist suction pipe 1 is provided in the chamber 21.
0 is connected to the oil mist suction pipe 10, and an oil mist passage pipe 1 in which enlarged cross-sectional areas 1a and reduced cross-sectional areas are alternately provided is connected to the oil mist suction pipe 10. An oil mist collecting device characterized in that a trapping body 2 with which oil mist collides is provided on the side.